Improved milling-machine



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LUKE CHAPMAN, OF COLLINSVILLE, CONNECTICUT, ASSIGNOR TO THE COLLINS COMPANY, OF SAME PLACE.

Letters Patent No. 99,059, datedJanuary 25, 1870.

IMPROVED MLLIGFMACINE.

l OdOb-a-n- The Schedule referred to in these Letters Patent and making part of the same.

To all whom it mayooncern Be it known that I, LUKE CHAPMAN, of `Collns ville, county of Hartford, and State of Connecticut,

- have invented a new and useful Improvement in MillingLMachines; and I declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming a part of this specitication.

Figure 1 is a side elevation.

Figure 2 is a plan view.

Figure 3 is a detached view of a milling-tool or cutter.

Like letters indicate like parts in all the figures.

This milling-machine is intended for milling a rounded or other surface lupon the side of a bar of metal, for cutting a serew-thread upon such rounded surface, and for similar purposes. I will show its action in the manufacture of my patent wrench-bar.

The letter a designates the frame of the machine, supported'upon four legs, one at each corner, two of which, b b, are seen in fig. 1.

At one end ofthe frame is the adjustable carriage c, which is moved lengthwise of the frame by the regu` latingserew d, and crosswise by the screw e.

On the carriage c are fastened the stanchions f f, which support the shaft g, driven by a belt upon the wheel h.

At the other extremity from the 'wheel h is fixed the cutter or milling-tool t, the character of which may be varied for different purposes.

It will be readily understood'that by means of the two regulating-screws 'd and e, the cutter t can be brought into different positions, as desired.

The letters jj indicate two stanchions rigidly xed to the frame a, having, at their tops, bearings for the shaft k, which is rotated,-when desired, by the handle l.

The end m of this shafthas a screw cut upon it, corresponding to the thread it is desired to cut upon the wrench-bar n, and this screw fits into a female screw in the healing z, so that, when the handle Zis rotated, the whole shaft Ic is moved backward or forward. f At the other end of the shaft k is a device for temporarily fastening alwrench-bar to the shaft, in such shape'that the centre of the wrench-bar and the centre of the shaft shall be aboutin the same line.

A screw, o, pressing down upon the plate p, furnishes the necessary grip for keeping the wrench-bar secure in its place.

New, a cutter, like that shown in g. 3, being fast ened upon the shaft g, the shaft being meanwhile driven by power, and the cutter having been brought into proper position by means of the regulating-screws l and e, the shaft k isrotated by means of the hand upon the handle l, orits equivalent,l through about a quarter of a circle; and the side of the wrench-bar next the cutter will be milled oi' into a curved or rounded surface. v

Now,.substitute the cutterq for the one shown in lig. 3, repeat the operation just described, and a thread will he cut upon the rounded surface. It will be observed that the cutter 'i is the same as the cutter shown in ng. 3, except that it has grooves running around it at regular intervals, corresponding to the pitch of the screw m. They need not run obliquely around, but will do the work as well if they run straight around. So far, I have only described the application of this machine to the manufacture of wrench-bars. It is obvious that it is quite as applicable to numerous other and similar purposes.

I claim, as my invention- The -shaft It, combined with the graspingdevice, in the manner and for the purpose described.

Also, the combination of the shaft k, the said grasping-device, and the handle l.

Also, the shaft k, and grasping-device, in combi-I nation with the screw atm, andits corresponding female screw.

Also, the shaft 75, and the graspingdevice,`in combination with the milling-tool t, or any other millingtool or device which can be used in its place.

Also, the holding-device on the end of shaft k, constructed, arranged, and operated as set forth.

' LUKE CHAPMAN.

Witnesses:

W. E. SIMMONS, GEO. G. SILL. 

